HtmlUnit & GWT error
https://stackoverflow.com/questions/4512249
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12-10-2019 - |
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I've a GWT application that I try to index.
I am using HtmlUnit to get the content of the generated HTML:
WebClient webClient = new WebClient(BrowserVersion.FIREFOX_3_6);
HtmlPage refDesing = webClient.getPage("http://localhost:8080/MyGWTApp/#page2");
FileOutputStream fos1 = new FileOutputStream("D:\\work\\out\\page2.html");
fos1.write(refDesing.asXml().getBytes());
fos1.close();
But I get the following error and the page returned approximately empty!
Dec 22, 2010 6:16:25 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'http://xxxxxxxxxxxx/xxxxxxxx/xxxxxxxx/xxxxxxxxxx.nocache.js', but got 'application/x-javascript'.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [485:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [485:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [485:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [518:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [518:29] Error in style rule. Invalid token "\n ". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [518:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [541:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [541:29] Error in style rule. Invalid token "\n ". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [541:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [951:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [951:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [951:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [977:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [977:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [977:29] Ignoring the following declarations in this rule.
EDIT:
What I mean by approximately empty is, here's snapshot of the returned HTML:
Please note that, not all data that is displayed in the original page (which original got from DB) is returned by HtmlUnit. Also What "?" means? I don't think it means any encoding error cause all words are clear ASCII characters.
<td align="center" style="vertical-align: top;">
<table class="refDesignGrid" cellspacing="5">
<colgroup>
<col/>
</colgroup>
<tbody align="left">
<tr>
<td align="left" style="vertical-align: top;">
<table cellpadding="0" class="categoryItem" cellspacing="0">
<tbody align="left">
<tr>
<td align="left" style="vertical-align: top;">
<div class="header4">
C++
</div>
</td>
</tr>
</tbody>
</table>
</td>
<td align="left" style="vertical-align: top;">
<table cellpadding="0" class="categoryItem" cellspacing="0">
<tbody align="left">
<tr>
<td align="left" style="vertical-align: top;">
<div class="header4">
Java
</div>
</td>
</tr>
</tbody>
</table>
</td>
<td align="left">
<table cellpadding="0" class="categoryItem" cellspacing="0">
<tbody align="left">
<tr>
<td align="left" style="vertical-align: top;">
<div class="header4">
C#
</div>
</td>
</tr>
</tbody>
</table>
</td>
<td>
?
</td>
</tr>
<tr>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
</tr>
<tr>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
</tr>
<tr>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
</tr>
<tr>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
<td>
?
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
المحلول 2
Answer is here: http://htmlunit.sourceforge.net/faq.html#AJAXDoesNotWork
The main thread using HtmlUnit may be finishing execution before allowing background threads to run. You have a couple of options:
webClient.setAjaxController(new NicelyResynchronizingAjaxController()); will tell your WebClient instance to re-synchronize asynchronous XHR. webClient.waitForBackgroundJavaScript(10000); or webClient.waitForBackgroundJavaScriptStartingBefore(10000); just after getting the page and before manipulating it. Explicitly wait for a condition that is expected be fulfilled when your JavaScript runs, e.g.
//try 20 times to wait .5 second each for filling the page. for (int i = 0; i < 20; i++) { if (condition_to_happen_after_js_execution) { break; } synchronized (page) { page.wait(500); } }
نصائح أخرى
HtmlUnit can be kinda chatty, and in particular can make things look worse than they are.
Create these two classes:
import org.w3c.css.sac.CSSException;
import org.w3c.css.sac.CSSParseException;
import com.gargoylesoftware.htmlunit.DefaultCssErrorHandler;
/*
* get rid of warnings... and provide a place to hang a break point
*/
public class QuietCssErrorHandler
extends DefaultCssErrorHandler
{
@Override public void error( CSSParseException e ) throws CSSException
{
super.error( e ) ;
}
@Override public void fatalError( CSSParseException e ) throws CSSException
{
super.fatalError( e ) ;
}
@Override public void warning( CSSParseException e ) throws CSSException
{
}
}
and
import com.gargoylesoftware.htmlunit.IncorrectnessListener;
public class SilentIncorrectnessListener
implements IncorrectnessListener
{
@Override public void notify( String message, Object origin )
{
// do nuttin' honey!
}
}
then when you create your WebClient...
wc.setIncorrectnessListener( new SilentIncorrectnessListener() ) ;
wc.setCssErrorHandler( new QuietCssErrorHandler() ) ;
And you should then get fewer warnings.
As for "approximately empty"... what does that mean?
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